linux-kernel - Re: [PATCH 3/3] acpi, memory-hotplug: Support getting hotplug info from SRAT.

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Message-Id: <20130125171230.34c5a273.akpm@linux-foundation.org>
Date:	Fri, 25 Jan 2013 17:12:30 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	jiang.liu@...wei.com, wujianguo@...wei.com, hpa@...or.com,
	wency@...fujitsu.com, laijs@...fujitsu.com, linfeng@...fujitsu.com,
	yinghai@...nel.org, isimatu.yasuaki@...fujitsu.com,
	rob@...dley.net, kosaki.motohiro@...fujitsu.com,
	minchan.kim@...il.com, mgorman@...e.de, rientjes@...gle.com,
	guz.fnst@...fujitsu.com, rusty@...tcorp.com.au, lliubbo@...il.com,
	jaegeuk.hanse@...il.com, tony.luck@...el.com,
	glommer@...allels.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/3] acpi, memory-hotplug: Support getting hotplug info
 from SRAT.

On Fri, 25 Jan 2013 17:42:09 +0800
Tang Chen <tangchen@...fujitsu.com> wrote:

> NOTE: Using this way will cause NUMA performance down because the whole node
>       will be set as ZONE_MOVABLE, and kernel cannot use memory on it.
>       If users don't want to lose NUMA performance, just don't use it.

I agree with this, but it means that nobody will test any of your new code.

To get improved testing coverage, can you think of any temporary
testing-only patch which will cause testers to exercise the
memory-hotplug changes?

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